2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk-provider.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
142 #include <asm/system_misc.h>
145 #include "omap_hwmod.h"
149 #include "clockdomain.h"
150 #include "powerdomain.h"
153 #include "cminst44xx.h"
159 #include "prminst44xx.h"
163 /* Name of the OMAP hwmod for the MPU */
164 #define MPU_INITIATOR_NAME "mpu"
167 * Number of struct omap_hwmod_link records per struct
168 * omap_hwmod_ocp_if record (master->slave and slave->master)
170 #define LINKS_PER_OCP_IF 2
173 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
174 * @enable_module: function to enable a module (via MODULEMODE)
175 * @disable_module: function to disable a module (via MODULEMODE)
177 * XXX Eventually this functionality will be hidden inside the PRM/CM
178 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
179 * conditionals in this code.
181 struct omap_hwmod_soc_ops {
182 void (*enable_module)(struct omap_hwmod *oh);
183 int (*disable_module)(struct omap_hwmod *oh);
184 int (*wait_target_ready)(struct omap_hwmod *oh);
185 int (*assert_hardreset)(struct omap_hwmod *oh,
186 struct omap_hwmod_rst_info *ohri);
187 int (*deassert_hardreset)(struct omap_hwmod *oh,
188 struct omap_hwmod_rst_info *ohri);
189 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
190 struct omap_hwmod_rst_info *ohri);
191 int (*init_clkdm)(struct omap_hwmod *oh);
192 void (*update_context_lost)(struct omap_hwmod *oh);
193 int (*get_context_lost)(struct omap_hwmod *oh);
196 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
197 static struct omap_hwmod_soc_ops soc_ops;
199 /* omap_hwmod_list contains all registered struct omap_hwmods */
200 static LIST_HEAD(omap_hwmod_list);
202 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
203 static struct omap_hwmod *mpu_oh;
205 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
206 static DEFINE_SPINLOCK(io_chain_lock);
209 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
210 * allocated from - used to reduce the number of small memory
211 * allocations, which has a significant impact on performance
213 static struct omap_hwmod_link *linkspace;
216 * free_ls, max_ls: array indexes into linkspace; representing the
217 * next free struct omap_hwmod_link index, and the maximum number of
218 * struct omap_hwmod_link records allocated (respectively)
220 static unsigned short free_ls, max_ls, ls_supp;
222 /* inited: set to true once the hwmod code is initialized */
225 /* Private functions */
228 * _fetch_next_ocp_if - return the next OCP interface in a list
229 * @p: ptr to a ptr to the list_head inside the ocp_if to return
230 * @i: pointer to the index of the element pointed to by @p in the list
232 * Return a pointer to the struct omap_hwmod_ocp_if record
233 * containing the struct list_head pointed to by @p, and increment
234 * @p such that a future call to this routine will return the next
237 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
240 struct omap_hwmod_ocp_if *oi;
242 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
251 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
252 * @oh: struct omap_hwmod *
254 * Load the current value of the hwmod OCP_SYSCONFIG register into the
255 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
256 * OCP_SYSCONFIG register or 0 upon success.
258 static int _update_sysc_cache(struct omap_hwmod *oh)
260 if (!oh->class->sysc) {
261 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
265 /* XXX ensure module interface clock is up */
267 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
269 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
270 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
276 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
277 * @v: OCP_SYSCONFIG value to write
278 * @oh: struct omap_hwmod *
280 * Write @v into the module class' OCP_SYSCONFIG register, if it has
281 * one. No return value.
283 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
285 if (!oh->class->sysc) {
286 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
290 /* XXX ensure module interface clock is up */
292 /* Module might have lost context, always update cache and register */
294 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
298 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
299 * @oh: struct omap_hwmod *
300 * @standbymode: MIDLEMODE field bits
301 * @v: pointer to register contents to modify
303 * Update the master standby mode bits in @v to be @standbymode for
304 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
305 * upon error or 0 upon success.
307 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
313 if (!oh->class->sysc ||
314 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
317 if (!oh->class->sysc->sysc_fields) {
318 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
322 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
323 mstandby_mask = (0x3 << mstandby_shift);
325 *v &= ~mstandby_mask;
326 *v |= __ffs(standbymode) << mstandby_shift;
332 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
333 * @oh: struct omap_hwmod *
334 * @idlemode: SIDLEMODE field bits
335 * @v: pointer to register contents to modify
337 * Update the slave idle mode bits in @v to be @idlemode for the @oh
338 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
341 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
346 if (!oh->class->sysc ||
347 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
350 if (!oh->class->sysc->sysc_fields) {
351 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
355 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
356 sidle_mask = (0x3 << sidle_shift);
359 *v |= __ffs(idlemode) << sidle_shift;
365 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
366 * @oh: struct omap_hwmod *
367 * @clockact: CLOCKACTIVITY field bits
368 * @v: pointer to register contents to modify
370 * Update the clockactivity mode bits in @v to be @clockact for the
371 * @oh hwmod. Used for additional powersaving on some modules. Does
372 * not write to the hardware. Returns -EINVAL upon error or 0 upon
375 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
380 if (!oh->class->sysc ||
381 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
384 if (!oh->class->sysc->sysc_fields) {
385 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
389 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
390 clkact_mask = (0x3 << clkact_shift);
393 *v |= clockact << clkact_shift;
399 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
400 * @oh: struct omap_hwmod *
401 * @v: pointer to register contents to modify
403 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
404 * error or 0 upon success.
406 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
410 if (!oh->class->sysc ||
411 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
414 if (!oh->class->sysc->sysc_fields) {
415 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
419 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
427 * _wait_softreset_complete - wait for an OCP softreset to complete
428 * @oh: struct omap_hwmod * to wait on
430 * Wait until the IP block represented by @oh reports that its OCP
431 * softreset is complete. This can be triggered by software (see
432 * _ocp_softreset()) or by hardware upon returning from off-mode (one
433 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
434 * microseconds. Returns the number of microseconds waited.
436 static int _wait_softreset_complete(struct omap_hwmod *oh)
438 struct omap_hwmod_class_sysconfig *sysc;
442 sysc = oh->class->sysc;
444 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
445 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
446 & SYSS_RESETDONE_MASK),
447 MAX_MODULE_SOFTRESET_WAIT, c);
448 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
449 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
450 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
452 MAX_MODULE_SOFTRESET_WAIT, c);
459 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
460 * @oh: struct omap_hwmod *
462 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
463 * of some modules. When the DMA must perform read/write accesses, the
464 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
465 * for power management, software must set the DMADISABLE bit back to 1.
467 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
468 * error or 0 upon success.
470 static int _set_dmadisable(struct omap_hwmod *oh)
475 if (!oh->class->sysc ||
476 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
479 if (!oh->class->sysc->sysc_fields) {
480 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
484 /* clocks must be on for this operation */
485 if (oh->_state != _HWMOD_STATE_ENABLED) {
486 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
490 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
494 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
495 v |= dmadisable_mask;
496 _write_sysconfig(v, oh);
502 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
503 * @oh: struct omap_hwmod *
504 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
505 * @v: pointer to register contents to modify
507 * Update the module autoidle bit in @v to be @autoidle for the @oh
508 * hwmod. The autoidle bit controls whether the module can gate
509 * internal clocks automatically when it isn't doing anything; the
510 * exact function of this bit varies on a per-module basis. This
511 * function does not write to the hardware. Returns -EINVAL upon
512 * error or 0 upon success.
514 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
520 if (!oh->class->sysc ||
521 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
524 if (!oh->class->sysc->sysc_fields) {
525 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
529 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
530 autoidle_mask = (0x1 << autoidle_shift);
532 *v &= ~autoidle_mask;
533 *v |= autoidle << autoidle_shift;
539 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
540 * @oh: struct omap_hwmod *
541 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
543 * Set or clear the I/O pad wakeup flag in the mux entries for the
544 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
545 * in memory. If the hwmod is currently idled, and the new idle
546 * values don't match the previous ones, this function will also
547 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
548 * currently idled, this function won't touch the hardware: the new
549 * mux settings are written to the SCM PADCTRL registers when the
550 * hwmod is idled. No return value.
552 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
554 struct omap_device_pad *pad;
559 if (!oh->mux || !oh->mux->enabled)
562 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
563 pad = oh->mux->pads_dynamic[j];
565 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
568 prev_idle = pad->idle;
571 pad->idle |= OMAP_WAKEUP_EN;
573 pad->idle &= ~OMAP_WAKEUP_EN;
575 if (prev_idle != pad->idle)
579 if (change && oh->_state == _HWMOD_STATE_IDLE)
580 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
584 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
585 * @oh: struct omap_hwmod *
587 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
588 * upon error or 0 upon success.
590 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
592 if (!oh->class->sysc ||
593 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
594 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
595 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
598 if (!oh->class->sysc->sysc_fields) {
599 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
603 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
604 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
606 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
607 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
608 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
609 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
611 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
613 oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;
619 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
620 * @oh: struct omap_hwmod *
622 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
623 * upon error or 0 upon success.
625 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
627 if (!oh->class->sysc ||
628 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
629 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
630 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
633 if (!oh->class->sysc->sysc_fields) {
634 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
638 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
639 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
641 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
642 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
643 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
644 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
646 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
648 oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;
653 static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
655 struct clk_hw_omap *clk;
659 } else if (oh->_clk) {
660 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
667 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
668 * @oh: struct omap_hwmod *
670 * Prevent the hardware module @oh from entering idle while the
671 * hardare module initiator @init_oh is active. Useful when a module
672 * will be accessed by a particular initiator (e.g., if a module will
673 * be accessed by the IVA, there should be a sleepdep between the IVA
674 * initiator and the module). Only applies to modules in smart-idle
675 * mode. If the clockdomain is marked as not needing autodeps, return
676 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
677 * passes along clkdm_add_sleepdep() value upon success.
679 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
681 struct clockdomain *clkdm, *init_clkdm;
683 clkdm = _get_clkdm(oh);
684 init_clkdm = _get_clkdm(init_oh);
686 if (!clkdm || !init_clkdm)
689 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
692 return clkdm_add_sleepdep(clkdm, init_clkdm);
696 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
697 * @oh: struct omap_hwmod *
699 * Allow the hardware module @oh to enter idle while the hardare
700 * module initiator @init_oh is active. Useful when a module will not
701 * be accessed by a particular initiator (e.g., if a module will not
702 * be accessed by the IVA, there should be no sleepdep between the IVA
703 * initiator and the module). Only applies to modules in smart-idle
704 * mode. If the clockdomain is marked as not needing autodeps, return
705 * 0 without doing anything. Returns -EINVAL upon error or passes
706 * along clkdm_del_sleepdep() value upon success.
708 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
710 struct clockdomain *clkdm, *init_clkdm;
712 clkdm = _get_clkdm(oh);
713 init_clkdm = _get_clkdm(init_oh);
715 if (!clkdm || !init_clkdm)
718 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
721 return clkdm_del_sleepdep(clkdm, init_clkdm);
725 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
726 * @oh: struct omap_hwmod *
728 * Called from _init_clocks(). Populates the @oh _clk (main
729 * functional clock pointer) if a main_clk is present. Returns 0 on
730 * success or -EINVAL on error.
732 static int _init_main_clk(struct omap_hwmod *oh)
739 oh->_clk = clk_get(NULL, oh->main_clk);
740 if (IS_ERR(oh->_clk)) {
741 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
742 oh->name, oh->main_clk);
746 * HACK: This needs a re-visit once clk_prepare() is implemented
747 * to do something meaningful. Today its just a no-op.
748 * If clk_prepare() is used at some point to do things like
749 * voltage scaling etc, then this would have to be moved to
750 * some point where subsystems like i2c and pmic become
753 clk_prepare(oh->_clk);
756 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
757 oh->name, oh->main_clk);
763 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
764 * @oh: struct omap_hwmod *
766 * Called from _init_clocks(). Populates the @oh OCP slave interface
767 * clock pointers. Returns 0 on success or -EINVAL on error.
769 static int _init_interface_clks(struct omap_hwmod *oh)
771 struct omap_hwmod_ocp_if *os;
777 p = oh->slave_ports.next;
779 while (i < oh->slaves_cnt) {
780 os = _fetch_next_ocp_if(&p, &i);
784 c = clk_get(NULL, os->clk);
786 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
792 * HACK: This needs a re-visit once clk_prepare() is implemented
793 * to do something meaningful. Today its just a no-op.
794 * If clk_prepare() is used at some point to do things like
795 * voltage scaling etc, then this would have to be moved to
796 * some point where subsystems like i2c and pmic become
799 clk_prepare(os->_clk);
806 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
807 * @oh: struct omap_hwmod *
809 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
810 * clock pointers. Returns 0 on success or -EINVAL on error.
812 static int _init_opt_clks(struct omap_hwmod *oh)
814 struct omap_hwmod_opt_clk *oc;
819 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
820 c = clk_get(NULL, oc->clk);
822 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
828 * HACK: This needs a re-visit once clk_prepare() is implemented
829 * to do something meaningful. Today its just a no-op.
830 * If clk_prepare() is used at some point to do things like
831 * voltage scaling etc, then this would have to be moved to
832 * some point where subsystems like i2c and pmic become
835 clk_prepare(oc->_clk);
842 * _enable_clocks - enable hwmod main clock and interface clocks
843 * @oh: struct omap_hwmod *
845 * Enables all clocks necessary for register reads and writes to succeed
846 * on the hwmod @oh. Returns 0.
848 static int _enable_clocks(struct omap_hwmod *oh)
850 struct omap_hwmod_ocp_if *os;
854 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
857 clk_enable(oh->_clk);
859 p = oh->slave_ports.next;
861 while (i < oh->slaves_cnt) {
862 os = _fetch_next_ocp_if(&p, &i);
864 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
865 clk_enable(os->_clk);
868 /* The opt clocks are controlled by the device driver. */
874 * _disable_clocks - disable hwmod main clock and interface clocks
875 * @oh: struct omap_hwmod *
877 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
879 static int _disable_clocks(struct omap_hwmod *oh)
881 struct omap_hwmod_ocp_if *os;
885 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
888 clk_disable(oh->_clk);
890 p = oh->slave_ports.next;
892 while (i < oh->slaves_cnt) {
893 os = _fetch_next_ocp_if(&p, &i);
895 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
896 clk_disable(os->_clk);
899 /* The opt clocks are controlled by the device driver. */
904 static void _enable_optional_clocks(struct omap_hwmod *oh)
906 struct omap_hwmod_opt_clk *oc;
909 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
911 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
913 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
914 __clk_get_name(oc->_clk));
915 clk_enable(oc->_clk);
919 static void _disable_optional_clocks(struct omap_hwmod *oh)
921 struct omap_hwmod_opt_clk *oc;
924 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
926 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
928 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
929 __clk_get_name(oc->_clk));
930 clk_disable(oc->_clk);
935 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
936 * @oh: struct omap_hwmod *
938 * Enables the PRCM module mode related to the hwmod @oh.
941 static void _omap4_enable_module(struct omap_hwmod *oh)
943 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
946 pr_debug("omap_hwmod: %s: %s: %d\n",
947 oh->name, __func__, oh->prcm.omap4.modulemode);
949 omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
950 oh->clkdm->prcm_partition,
952 oh->clkdm->clkdm_offs,
953 oh->prcm.omap4.clkctrl_offs);
957 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
958 * @oh: struct omap_hwmod *
960 * Enables the PRCM module mode related to the hwmod @oh.
963 static void _am33xx_enable_module(struct omap_hwmod *oh)
965 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
968 pr_debug("omap_hwmod: %s: %s: %d\n",
969 oh->name, __func__, oh->prcm.omap4.modulemode);
971 am33xx_cm_module_enable(oh->prcm.omap4.modulemode, oh->clkdm->cm_inst,
972 oh->clkdm->clkdm_offs,
973 oh->prcm.omap4.clkctrl_offs);
977 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
978 * @oh: struct omap_hwmod *
980 * Wait for a module @oh to enter slave idle. Returns 0 if the module
981 * does not have an IDLEST bit or if the module successfully enters
982 * slave idle; otherwise, pass along the return value of the
983 * appropriate *_cm*_wait_module_idle() function.
985 static int _omap4_wait_target_disable(struct omap_hwmod *oh)
990 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
993 if (oh->flags & HWMOD_NO_IDLEST)
996 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
998 oh->clkdm->clkdm_offs,
999 oh->prcm.omap4.clkctrl_offs);
1003 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
1004 * @oh: struct omap_hwmod *
1006 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1007 * does not have an IDLEST bit or if the module successfully enters
1008 * slave idle; otherwise, pass along the return value of the
1009 * appropriate *_cm*_wait_module_idle() function.
1011 static int _am33xx_wait_target_disable(struct omap_hwmod *oh)
1016 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1019 if (oh->flags & HWMOD_NO_IDLEST)
1022 return am33xx_cm_wait_module_idle(oh->clkdm->cm_inst,
1023 oh->clkdm->clkdm_offs,
1024 oh->prcm.omap4.clkctrl_offs);
1028 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1029 * @oh: struct omap_hwmod *oh
1031 * Count and return the number of MPU IRQs associated with the hwmod
1032 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1035 static int _count_mpu_irqs(struct omap_hwmod *oh)
1037 struct omap_hwmod_irq_info *ohii;
1040 if (!oh || !oh->mpu_irqs)
1044 ohii = &oh->mpu_irqs[i++];
1045 } while (ohii->irq != -1);
1051 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1052 * @oh: struct omap_hwmod *oh
1054 * Count and return the number of SDMA request lines associated with
1055 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1058 static int _count_sdma_reqs(struct omap_hwmod *oh)
1060 struct omap_hwmod_dma_info *ohdi;
1063 if (!oh || !oh->sdma_reqs)
1067 ohdi = &oh->sdma_reqs[i++];
1068 } while (ohdi->dma_req != -1);
1074 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1075 * @oh: struct omap_hwmod *oh
1077 * Count and return the number of address space ranges associated with
1078 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1081 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
1083 struct omap_hwmod_addr_space *mem;
1086 if (!os || !os->addr)
1090 mem = &os->addr[i++];
1091 } while (mem->pa_start != mem->pa_end);
1097 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1098 * @oh: struct omap_hwmod * to operate on
1099 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1100 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1102 * Retrieve a MPU hardware IRQ line number named by @name associated
1103 * with the IP block pointed to by @oh. The IRQ number will be filled
1104 * into the address pointed to by @dma. When @name is non-null, the
1105 * IRQ line number associated with the named entry will be returned.
1106 * If @name is null, the first matching entry will be returned. Data
1107 * order is not meaningful in hwmod data, so callers are strongly
1108 * encouraged to use a non-null @name whenever possible to avoid
1109 * unpredictable effects if hwmod data is later added that causes data
1110 * ordering to change. Returns 0 upon success or a negative error
1113 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1123 while (oh->mpu_irqs[i].irq != -1) {
1124 if (name == oh->mpu_irqs[i].name ||
1125 !strcmp(name, oh->mpu_irqs[i].name)) {
1135 *irq = oh->mpu_irqs[i].irq;
1141 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1142 * @oh: struct omap_hwmod * to operate on
1143 * @name: pointer to the name of the SDMA request line to fetch (optional)
1144 * @dma: pointer to an unsigned int to store the request line ID to
1146 * Retrieve an SDMA request line ID named by @name on the IP block
1147 * pointed to by @oh. The ID will be filled into the address pointed
1148 * to by @dma. When @name is non-null, the request line ID associated
1149 * with the named entry will be returned. If @name is null, the first
1150 * matching entry will be returned. Data order is not meaningful in
1151 * hwmod data, so callers are strongly encouraged to use a non-null
1152 * @name whenever possible to avoid unpredictable effects if hwmod
1153 * data is later added that causes data ordering to change. Returns 0
1154 * upon success or a negative error code upon error.
1156 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1166 while (oh->sdma_reqs[i].dma_req != -1) {
1167 if (name == oh->sdma_reqs[i].name ||
1168 !strcmp(name, oh->sdma_reqs[i].name)) {
1178 *dma = oh->sdma_reqs[i].dma_req;
1184 * _get_addr_space_by_name - fetch address space start & end by name
1185 * @oh: struct omap_hwmod * to operate on
1186 * @name: pointer to the name of the address space to fetch (optional)
1187 * @pa_start: pointer to a u32 to store the starting address to
1188 * @pa_end: pointer to a u32 to store the ending address to
1190 * Retrieve address space start and end addresses for the IP block
1191 * pointed to by @oh. The data will be filled into the addresses
1192 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1193 * address space data associated with the named entry will be
1194 * returned. If @name is null, the first matching entry will be
1195 * returned. Data order is not meaningful in hwmod data, so callers
1196 * are strongly encouraged to use a non-null @name whenever possible
1197 * to avoid unpredictable effects if hwmod data is later added that
1198 * causes data ordering to change. Returns 0 upon success or a
1199 * negative error code upon error.
1201 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1202 u32 *pa_start, u32 *pa_end)
1205 struct omap_hwmod_ocp_if *os;
1206 struct list_head *p = NULL;
1209 p = oh->slave_ports.next;
1212 while (i < oh->slaves_cnt) {
1213 os = _fetch_next_ocp_if(&p, &i);
1219 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1220 if (name == os->addr[j].name ||
1221 !strcmp(name, os->addr[j].name)) {
1235 *pa_start = os->addr[j].pa_start;
1236 *pa_end = os->addr[j].pa_end;
1242 * _save_mpu_port_index - find and save the index to @oh's MPU port
1243 * @oh: struct omap_hwmod *
1245 * Determines the array index of the OCP slave port that the MPU uses
1246 * to address the device, and saves it into the struct omap_hwmod.
1247 * Intended to be called during hwmod registration only. No return
1250 static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1252 struct omap_hwmod_ocp_if *os = NULL;
1253 struct list_head *p;
1259 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1261 p = oh->slave_ports.next;
1263 while (i < oh->slaves_cnt) {
1264 os = _fetch_next_ocp_if(&p, &i);
1265 if (os->user & OCP_USER_MPU) {
1267 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1276 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1277 * @oh: struct omap_hwmod *
1279 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1280 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1281 * communicate with the IP block. This interface need not be directly
1282 * connected to the MPU (and almost certainly is not), but is directly
1283 * connected to the IP block represented by @oh. Returns a pointer
1284 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1285 * error or if there does not appear to be a path from the MPU to this
1288 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1290 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1293 return oh->_mpu_port;
1297 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1298 * @oh: struct omap_hwmod *
1300 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1301 * the register target MPU address space; or returns NULL upon error.
1303 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1305 struct omap_hwmod_ocp_if *os;
1306 struct omap_hwmod_addr_space *mem;
1307 int found = 0, i = 0;
1309 os = _find_mpu_rt_port(oh);
1310 if (!os || !os->addr)
1314 mem = &os->addr[i++];
1315 if (mem->flags & ADDR_TYPE_RT)
1317 } while (!found && mem->pa_start != mem->pa_end);
1319 return (found) ? mem : NULL;
1323 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1324 * @oh: struct omap_hwmod *
1326 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1327 * by @oh is set to indicate to the PRCM that the IP block is active.
1328 * Usually this means placing the module into smart-idle mode and
1329 * smart-standby, but if there is a bug in the automatic idle handling
1330 * for the IP block, it may need to be placed into the force-idle or
1331 * no-idle variants of these modes. No return value.
1333 static void _enable_sysc(struct omap_hwmod *oh)
1338 struct clockdomain *clkdm;
1340 if (!oh->class->sysc)
1344 * Wait until reset has completed, this is needed as the IP
1345 * block is reset automatically by hardware in some cases
1346 * (off-mode for example), and the drivers require the
1347 * IP to be ready when they access it
1349 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1350 _enable_optional_clocks(oh);
1351 _wait_softreset_complete(oh);
1352 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1353 _disable_optional_clocks(oh);
1355 v = oh->_sysc_cache;
1356 sf = oh->class->sysc->sysc_flags;
1358 clkdm = _get_clkdm(oh);
1359 if (sf & SYSC_HAS_SIDLEMODE) {
1360 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1361 if (clkdm_act && !(oh->class->sysc->idlemodes &
1362 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1363 idlemode = HWMOD_IDLEMODE_FORCE;
1365 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
1366 HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
1367 _set_slave_idlemode(oh, idlemode, &v);
1370 if (sf & SYSC_HAS_MIDLEMODE) {
1371 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1372 idlemode = HWMOD_IDLEMODE_FORCE;
1373 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1374 idlemode = HWMOD_IDLEMODE_NO;
1376 if (sf & SYSC_HAS_ENAWAKEUP)
1377 _enable_wakeup(oh, &v);
1378 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1379 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1381 idlemode = HWMOD_IDLEMODE_SMART;
1383 _set_master_standbymode(oh, idlemode, &v);
1387 * XXX The clock framework should handle this, by
1388 * calling into this code. But this must wait until the
1389 * clock structures are tagged with omap_hwmod entries
1391 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1392 (sf & SYSC_HAS_CLOCKACTIVITY))
1393 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1395 /* If slave is in SMARTIDLE, also enable wakeup */
1396 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1397 _enable_wakeup(oh, &v);
1399 _write_sysconfig(v, oh);
1402 * Set the autoidle bit only after setting the smartidle bit
1403 * Setting this will not have any impact on the other modules.
1405 if (sf & SYSC_HAS_AUTOIDLE) {
1406 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1408 _set_module_autoidle(oh, idlemode, &v);
1409 _write_sysconfig(v, oh);
1414 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1415 * @oh: struct omap_hwmod *
1417 * If module is marked as SWSUP_SIDLE, force the module into slave
1418 * idle; otherwise, configure it for smart-idle. If module is marked
1419 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1420 * configure it for smart-standby. No return value.
1422 static void _idle_sysc(struct omap_hwmod *oh)
1427 if (!oh->class->sysc)
1430 v = oh->_sysc_cache;
1431 sf = oh->class->sysc->sysc_flags;
1433 if (sf & SYSC_HAS_SIDLEMODE) {
1434 /* XXX What about HWMOD_IDLEMODE_SMART_WKUP? */
1435 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1436 !(oh->class->sysc->idlemodes &
1437 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1438 idlemode = HWMOD_IDLEMODE_FORCE;
1440 idlemode = HWMOD_IDLEMODE_SMART;
1441 _set_slave_idlemode(oh, idlemode, &v);
1444 if (sf & SYSC_HAS_MIDLEMODE) {
1445 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1446 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1447 idlemode = HWMOD_IDLEMODE_FORCE;
1449 if (sf & SYSC_HAS_ENAWAKEUP)
1450 _enable_wakeup(oh, &v);
1451 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1452 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1454 idlemode = HWMOD_IDLEMODE_SMART;
1456 _set_master_standbymode(oh, idlemode, &v);
1459 /* If slave is in SMARTIDLE, also enable wakeup */
1460 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1461 _enable_wakeup(oh, &v);
1463 _write_sysconfig(v, oh);
1467 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1468 * @oh: struct omap_hwmod *
1470 * Force the module into slave idle and master suspend. No return
1473 static void _shutdown_sysc(struct omap_hwmod *oh)
1478 if (!oh->class->sysc)
1481 v = oh->_sysc_cache;
1482 sf = oh->class->sysc->sysc_flags;
1484 if (sf & SYSC_HAS_SIDLEMODE)
1485 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1487 if (sf & SYSC_HAS_MIDLEMODE)
1488 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1490 if (sf & SYSC_HAS_AUTOIDLE)
1491 _set_module_autoidle(oh, 1, &v);
1493 _write_sysconfig(v, oh);
1497 * _lookup - find an omap_hwmod by name
1498 * @name: find an omap_hwmod by name
1500 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1502 static struct omap_hwmod *_lookup(const char *name)
1504 struct omap_hwmod *oh, *temp_oh;
1508 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1509 if (!strcmp(name, temp_oh->name)) {
1519 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1520 * @oh: struct omap_hwmod *
1522 * Convert a clockdomain name stored in a struct omap_hwmod into a
1523 * clockdomain pointer, and save it into the struct omap_hwmod.
1524 * Return -EINVAL if the clkdm_name lookup failed.
1526 static int _init_clkdm(struct omap_hwmod *oh)
1528 if (!oh->clkdm_name) {
1529 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1533 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1535 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1536 oh->name, oh->clkdm_name);
1540 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1541 oh->name, oh->clkdm_name);
1547 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1548 * well the clockdomain.
1549 * @oh: struct omap_hwmod *
1550 * @data: not used; pass NULL
1552 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1553 * Resolves all clock names embedded in the hwmod. Returns 0 on
1554 * success, or a negative error code on failure.
1556 static int _init_clocks(struct omap_hwmod *oh, void *data)
1560 if (oh->_state != _HWMOD_STATE_REGISTERED)
1563 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1565 if (soc_ops.init_clkdm)
1566 ret |= soc_ops.init_clkdm(oh);
1568 ret |= _init_main_clk(oh);
1569 ret |= _init_interface_clks(oh);
1570 ret |= _init_opt_clks(oh);
1573 oh->_state = _HWMOD_STATE_CLKS_INITED;
1575 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1581 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1582 * @oh: struct omap_hwmod *
1583 * @name: name of the reset line in the context of this hwmod
1584 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1586 * Return the bit position of the reset line that match the
1587 * input name. Return -ENOENT if not found.
1589 static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1590 struct omap_hwmod_rst_info *ohri)
1594 for (i = 0; i < oh->rst_lines_cnt; i++) {
1595 const char *rst_line = oh->rst_lines[i].name;
1596 if (!strcmp(rst_line, name)) {
1597 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1598 ohri->st_shift = oh->rst_lines[i].st_shift;
1599 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1600 oh->name, __func__, rst_line, ohri->rst_shift,
1611 * _assert_hardreset - assert the HW reset line of submodules
1612 * contained in the hwmod module.
1613 * @oh: struct omap_hwmod *
1614 * @name: name of the reset line to lookup and assert
1616 * Some IP like dsp, ipu or iva contain processor that require an HW
1617 * reset line to be assert / deassert in order to enable fully the IP.
1618 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1619 * asserting the hardreset line on the currently-booted SoC, or passes
1620 * along the return value from _lookup_hardreset() or the SoC's
1621 * assert_hardreset code.
1623 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1625 struct omap_hwmod_rst_info ohri;
1631 if (!soc_ops.assert_hardreset)
1634 ret = _lookup_hardreset(oh, name, &ohri);
1638 ret = soc_ops.assert_hardreset(oh, &ohri);
1644 * _deassert_hardreset - deassert the HW reset line of submodules contained
1645 * in the hwmod module.
1646 * @oh: struct omap_hwmod *
1647 * @name: name of the reset line to look up and deassert
1649 * Some IP like dsp, ipu or iva contain processor that require an HW
1650 * reset line to be assert / deassert in order to enable fully the IP.
1651 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1652 * deasserting the hardreset line on the currently-booted SoC, or passes
1653 * along the return value from _lookup_hardreset() or the SoC's
1654 * deassert_hardreset code.
1656 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1658 struct omap_hwmod_rst_info ohri;
1665 if (!soc_ops.deassert_hardreset)
1668 ret = _lookup_hardreset(oh, name, &ohri);
1669 if (IS_ERR_VALUE(ret))
1674 * A clockdomain must be in SW_SUP otherwise reset
1675 * might not be completed. The clockdomain can be set
1676 * in HW_AUTO only when the module become ready.
1678 hwsup = clkdm_in_hwsup(oh->clkdm);
1679 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1681 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1682 oh->name, oh->clkdm->name, ret);
1688 if (soc_ops.enable_module)
1689 soc_ops.enable_module(oh);
1691 ret = soc_ops.deassert_hardreset(oh, &ohri);
1693 if (soc_ops.disable_module)
1694 soc_ops.disable_module(oh);
1695 _disable_clocks(oh);
1698 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1702 * Set the clockdomain to HW_AUTO, assuming that the
1703 * previous state was HW_AUTO.
1705 if (oh->clkdm && hwsup)
1706 clkdm_allow_idle(oh->clkdm);
1709 clkdm_hwmod_disable(oh->clkdm, oh);
1716 * _read_hardreset - read the HW reset line state of submodules
1717 * contained in the hwmod module
1718 * @oh: struct omap_hwmod *
1719 * @name: name of the reset line to look up and read
1721 * Return the state of the reset line. Returns -EINVAL if @oh is
1722 * null, -ENOSYS if we have no way of reading the hardreset line
1723 * status on the currently-booted SoC, or passes along the return
1724 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1727 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1729 struct omap_hwmod_rst_info ohri;
1735 if (!soc_ops.is_hardreset_asserted)
1738 ret = _lookup_hardreset(oh, name, &ohri);
1742 return soc_ops.is_hardreset_asserted(oh, &ohri);
1746 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1747 * @oh: struct omap_hwmod *
1749 * If all hardreset lines associated with @oh are asserted, then return true.
1750 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1751 * associated with @oh are asserted, then return false.
1752 * This function is used to avoid executing some parts of the IP block
1753 * enable/disable sequence if its hardreset line is set.
1755 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1759 if (oh->rst_lines_cnt == 0)
1762 for (i = 0; i < oh->rst_lines_cnt; i++)
1763 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1766 if (oh->rst_lines_cnt == rst_cnt)
1773 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1775 * @oh: struct omap_hwmod *
1777 * If any hardreset lines associated with @oh are asserted, then
1778 * return true. Otherwise, if no hardreset lines associated with @oh
1779 * are asserted, or if @oh has no hardreset lines, then return false.
1780 * This function is used to avoid executing some parts of the IP block
1781 * enable/disable sequence if any hardreset line is set.
1783 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1788 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1789 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1792 return (rst_cnt) ? true : false;
1796 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1797 * @oh: struct omap_hwmod *
1799 * Disable the PRCM module mode related to the hwmod @oh.
1800 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1802 static int _omap4_disable_module(struct omap_hwmod *oh)
1806 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1810 * Since integration code might still be doing something, only
1811 * disable if all lines are under hardreset.
1813 if (_are_any_hardreset_lines_asserted(oh))
1816 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1818 omap4_cminst_module_disable(oh->clkdm->prcm_partition,
1820 oh->clkdm->clkdm_offs,
1821 oh->prcm.omap4.clkctrl_offs);
1823 v = _omap4_wait_target_disable(oh);
1825 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1832 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1833 * @oh: struct omap_hwmod *
1835 * Disable the PRCM module mode related to the hwmod @oh.
1836 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1838 static int _am33xx_disable_module(struct omap_hwmod *oh)
1842 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1845 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1847 if (_are_any_hardreset_lines_asserted(oh))
1850 am33xx_cm_module_disable(oh->clkdm->cm_inst, oh->clkdm->clkdm_offs,
1851 oh->prcm.omap4.clkctrl_offs);
1853 v = _am33xx_wait_target_disable(oh);
1855 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1862 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1863 * @oh: struct omap_hwmod *
1865 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1866 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1867 * reset this way, -EINVAL if the hwmod is in the wrong state,
1868 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1870 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1871 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1872 * use the SYSCONFIG softreset bit to provide the status.
1874 * Note that some IP like McBSP do have reset control but don't have
1877 static int _ocp_softreset(struct omap_hwmod *oh)
1883 if (!oh->class->sysc ||
1884 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1887 /* clocks must be on for this operation */
1888 if (oh->_state != _HWMOD_STATE_ENABLED) {
1889 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1894 /* For some modules, all optionnal clocks need to be enabled as well */
1895 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1896 _enable_optional_clocks(oh);
1898 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1900 v = oh->_sysc_cache;
1901 ret = _set_softreset(oh, &v);
1904 _write_sysconfig(v, oh);
1906 if (oh->class->sysc->srst_udelay)
1907 udelay(oh->class->sysc->srst_udelay);
1909 c = _wait_softreset_complete(oh);
1910 if (c == MAX_MODULE_SOFTRESET_WAIT)
1911 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1912 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1914 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1917 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1918 * _wait_target_ready() or _reset()
1921 ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1924 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1925 _disable_optional_clocks(oh);
1931 * _reset - reset an omap_hwmod
1932 * @oh: struct omap_hwmod *
1934 * Resets an omap_hwmod @oh. If the module has a custom reset
1935 * function pointer defined, then call it to reset the IP block, and
1936 * pass along its return value to the caller. Otherwise, if the IP
1937 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1938 * associated with it, call a function to reset the IP block via that
1939 * method, and pass along the return value to the caller. Finally, if
1940 * the IP block has some hardreset lines associated with it, assert
1941 * all of those, but do _not_ deassert them. (This is because driver
1942 * authors have expressed an apparent requirement to control the
1943 * deassertion of the hardreset lines themselves.)
1945 * The default software reset mechanism for most OMAP IP blocks is
1946 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1947 * hwmods cannot be reset via this method. Some are not targets and
1948 * therefore have no OCP header registers to access. Others (like the
1949 * IVA) have idiosyncratic reset sequences. So for these relatively
1950 * rare cases, custom reset code can be supplied in the struct
1951 * omap_hwmod_class .reset function pointer.
1953 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1954 * does not prevent idling of the system. This is necessary for cases
1955 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1956 * kernel without disabling dma.
1958 * Passes along the return value from either _ocp_softreset() or the
1959 * custom reset function - these must return -EINVAL if the hwmod
1960 * cannot be reset this way or if the hwmod is in the wrong state,
1961 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1963 static int _reset(struct omap_hwmod *oh)
1967 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1969 if (oh->class->reset) {
1970 r = oh->class->reset(oh);
1972 if (oh->rst_lines_cnt > 0) {
1973 for (i = 0; i < oh->rst_lines_cnt; i++)
1974 _assert_hardreset(oh, oh->rst_lines[i].name);
1977 r = _ocp_softreset(oh);
1983 _set_dmadisable(oh);
1986 * OCP_SYSCONFIG bits need to be reprogrammed after a
1987 * softreset. The _enable() function should be split to avoid
1988 * the rewrite of the OCP_SYSCONFIG register.
1990 if (oh->class->sysc) {
1991 _update_sysc_cache(oh);
1999 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
2001 * Call the appropriate PRM function to clear any logged I/O chain
2002 * wakeups and to reconfigure the chain. This apparently needs to be
2003 * done upon every mux change. Since hwmods can be concurrently
2004 * enabled and idled, hold a spinlock around the I/O chain
2005 * reconfiguration sequence. No return value.
2007 * XXX When the PRM code is moved to drivers, this function can be removed,
2008 * as the PRM infrastructure should abstract this.
2010 static void _reconfigure_io_chain(void)
2012 unsigned long flags;
2014 spin_lock_irqsave(&io_chain_lock, flags);
2016 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
2017 omap3xxx_prm_reconfigure_io_chain();
2018 else if (cpu_is_omap44xx())
2019 omap44xx_prm_reconfigure_io_chain();
2021 spin_unlock_irqrestore(&io_chain_lock, flags);
2025 * _omap4_update_context_lost - increment hwmod context loss counter if
2026 * hwmod context was lost, and clear hardware context loss reg
2027 * @oh: hwmod to check for context loss
2029 * If the PRCM indicates that the hwmod @oh lost context, increment
2030 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2031 * bits. No return value.
2033 static void _omap4_update_context_lost(struct omap_hwmod *oh)
2035 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
2038 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2039 oh->clkdm->pwrdm.ptr->prcm_offs,
2040 oh->prcm.omap4.context_offs))
2043 oh->prcm.omap4.context_lost_counter++;
2044 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2045 oh->clkdm->pwrdm.ptr->prcm_offs,
2046 oh->prcm.omap4.context_offs);
2050 * _omap4_get_context_lost - get context loss counter for a hwmod
2051 * @oh: hwmod to get context loss counter for
2053 * Returns the in-memory context loss counter for a hwmod.
2055 static int _omap4_get_context_lost(struct omap_hwmod *oh)
2057 return oh->prcm.omap4.context_lost_counter;
2061 * _enable_preprogram - Pre-program an IP block during the _enable() process
2062 * @oh: struct omap_hwmod *
2064 * Some IP blocks (such as AESS) require some additional programming
2065 * after enable before they can enter idle. If a function pointer to
2066 * do so is present in the hwmod data, then call it and pass along the
2067 * return value; otherwise, return 0.
2069 static int __init _enable_preprogram(struct omap_hwmod *oh)
2071 if (!oh->class->enable_preprogram)
2074 return oh->class->enable_preprogram(oh);
2078 * _enable - enable an omap_hwmod
2079 * @oh: struct omap_hwmod *
2081 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2082 * register target. Returns -EINVAL if the hwmod is in the wrong
2083 * state or passes along the return value of _wait_target_ready().
2085 static int _enable(struct omap_hwmod *oh)
2090 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
2093 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2094 * state at init. Now that someone is really trying to enable
2095 * them, just ensure that the hwmod mux is set.
2097 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
2099 * If the caller has mux data populated, do the mux'ing
2100 * which wouldn't have been done as part of the _enable()
2101 * done during setup.
2104 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2106 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
2110 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
2111 oh->_state != _HWMOD_STATE_IDLE &&
2112 oh->_state != _HWMOD_STATE_DISABLED) {
2113 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2119 * If an IP block contains HW reset lines and all of them are
2120 * asserted, we let integration code associated with that
2121 * block handle the enable. We've received very little
2122 * information on what those driver authors need, and until
2123 * detailed information is provided and the driver code is
2124 * posted to the public lists, this is probably the best we
2127 if (_are_all_hardreset_lines_asserted(oh))
2130 /* Mux pins for device runtime if populated */
2131 if (oh->mux && (!oh->mux->enabled ||
2132 ((oh->_state == _HWMOD_STATE_IDLE) &&
2133 oh->mux->pads_dynamic))) {
2134 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2135 _reconfigure_io_chain();
2138 _add_initiator_dep(oh, mpu_oh);
2142 * A clockdomain must be in SW_SUP before enabling
2143 * completely the module. The clockdomain can be set
2144 * in HW_AUTO only when the module become ready.
2146 hwsup = clkdm_in_hwsup(oh->clkdm) &&
2147 !clkdm_missing_idle_reporting(oh->clkdm);
2148 r = clkdm_hwmod_enable(oh->clkdm, oh);
2150 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2151 oh->name, oh->clkdm->name, r);
2157 if (soc_ops.enable_module)
2158 soc_ops.enable_module(oh);
2159 if (oh->flags & HWMOD_BLOCK_WFI)
2162 if (soc_ops.update_context_lost)
2163 soc_ops.update_context_lost(oh);
2165 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
2169 * Set the clockdomain to HW_AUTO only if the target is ready,
2170 * assuming that the previous state was HW_AUTO
2172 if (oh->clkdm && hwsup)
2173 clkdm_allow_idle(oh->clkdm);
2175 oh->_state = _HWMOD_STATE_ENABLED;
2177 /* Access the sysconfig only if the target is ready */
2178 if (oh->class->sysc) {
2179 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
2180 _update_sysc_cache(oh);
2183 r = _enable_preprogram(oh);
2185 if (soc_ops.disable_module)
2186 soc_ops.disable_module(oh);
2187 _disable_clocks(oh);
2188 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
2192 clkdm_hwmod_disable(oh->clkdm, oh);
2199 * _idle - idle an omap_hwmod
2200 * @oh: struct omap_hwmod *
2202 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2203 * no further work. Returns -EINVAL if the hwmod is in the wrong
2204 * state or returns 0.
2206 static int _idle(struct omap_hwmod *oh)
2208 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2210 if (oh->_state != _HWMOD_STATE_ENABLED) {
2211 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2216 if (_are_all_hardreset_lines_asserted(oh))
2219 if (oh->class->sysc)
2221 _del_initiator_dep(oh, mpu_oh);
2223 if (oh->flags & HWMOD_BLOCK_WFI)
2225 if (soc_ops.disable_module)
2226 soc_ops.disable_module(oh);
2229 * The module must be in idle mode before disabling any parents
2230 * clocks. Otherwise, the parent clock might be disabled before
2231 * the module transition is done, and thus will prevent the
2232 * transition to complete properly.
2234 _disable_clocks(oh);
2236 clkdm_hwmod_disable(oh->clkdm, oh);
2238 /* Mux pins for device idle if populated */
2239 if (oh->mux && oh->mux->pads_dynamic) {
2240 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2241 _reconfigure_io_chain();
2244 oh->_state = _HWMOD_STATE_IDLE;
2250 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2251 * @oh: struct omap_hwmod *
2252 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2254 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2255 * local copy. Intended to be used by drivers that require
2256 * direct manipulation of the AUTOIDLE bits.
2257 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2258 * along the return value from _set_module_autoidle().
2260 * Any users of this function should be scrutinized carefully.
2262 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
2266 unsigned long flags;
2268 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
2271 spin_lock_irqsave(&oh->_lock, flags);
2273 v = oh->_sysc_cache;
2275 retval = _set_module_autoidle(oh, autoidle, &v);
2278 _write_sysconfig(v, oh);
2280 spin_unlock_irqrestore(&oh->_lock, flags);
2286 * _shutdown - shutdown an omap_hwmod
2287 * @oh: struct omap_hwmod *
2289 * Shut down an omap_hwmod @oh. This should be called when the driver
2290 * used for the hwmod is removed or unloaded or if the driver is not
2291 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2292 * state or returns 0.
2294 static int _shutdown(struct omap_hwmod *oh)
2299 if (oh->_state != _HWMOD_STATE_IDLE &&
2300 oh->_state != _HWMOD_STATE_ENABLED) {
2301 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2306 if (_are_all_hardreset_lines_asserted(oh))
2309 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2311 if (oh->class->pre_shutdown) {
2312 prev_state = oh->_state;
2313 if (oh->_state == _HWMOD_STATE_IDLE)
2315 ret = oh->class->pre_shutdown(oh);
2317 if (prev_state == _HWMOD_STATE_IDLE)
2323 if (oh->class->sysc) {
2324 if (oh->_state == _HWMOD_STATE_IDLE)
2329 /* clocks and deps are already disabled in idle */
2330 if (oh->_state == _HWMOD_STATE_ENABLED) {
2331 _del_initiator_dep(oh, mpu_oh);
2332 /* XXX what about the other system initiators here? dma, dsp */
2333 if (oh->flags & HWMOD_BLOCK_WFI)
2335 if (soc_ops.disable_module)
2336 soc_ops.disable_module(oh);
2337 _disable_clocks(oh);
2339 clkdm_hwmod_disable(oh->clkdm, oh);
2341 /* XXX Should this code also force-disable the optional clocks? */
2343 for (i = 0; i < oh->rst_lines_cnt; i++)
2344 _assert_hardreset(oh, oh->rst_lines[i].name);
2346 /* Mux pins to safe mode or use populated off mode values */
2348 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2350 oh->_state = _HWMOD_STATE_DISABLED;
2356 * _init_mpu_rt_base - populate the virtual address for a hwmod
2357 * @oh: struct omap_hwmod * to locate the virtual address
2359 * Cache the virtual address used by the MPU to access this IP block's
2360 * registers. This address is needed early so the OCP registers that
2361 * are part of the device's address space can be ioremapped properly.
2364 static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
2366 struct omap_hwmod_addr_space *mem;
2367 void __iomem *va_start;
2372 _save_mpu_port_index(oh);
2374 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2377 mem = _find_mpu_rt_addr_space(oh);
2379 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2384 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2386 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2390 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2391 oh->name, va_start);
2393 oh->_mpu_rt_va = va_start;
2397 * _init - initialize internal data for the hwmod @oh
2398 * @oh: struct omap_hwmod *
2401 * Look up the clocks and the address space used by the MPU to access
2402 * registers belonging to the hwmod @oh. @oh must already be
2403 * registered at this point. This is the first of two phases for
2404 * hwmod initialization. Code called here does not touch any hardware
2405 * registers, it simply prepares internal data structures. Returns 0
2406 * upon success or if the hwmod isn't registered, or -EINVAL upon
2409 static int __init _init(struct omap_hwmod *oh, void *data)
2413 if (oh->_state != _HWMOD_STATE_REGISTERED)
2416 _init_mpu_rt_base(oh, NULL);
2418 r = _init_clocks(oh, NULL);
2419 if (IS_ERR_VALUE(r)) {
2420 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2424 oh->_state = _HWMOD_STATE_INITIALIZED;
2430 * _setup_iclk_autoidle - configure an IP block's interface clocks
2431 * @oh: struct omap_hwmod *
2433 * Set up the module's interface clocks. XXX This function is still mostly
2434 * a stub; implementing this properly requires iclk autoidle usecounting in
2435 * the clock code. No return value.
2437 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2439 struct omap_hwmod_ocp_if *os;
2440 struct list_head *p;
2442 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2445 p = oh->slave_ports.next;
2447 while (i < oh->slaves_cnt) {
2448 os = _fetch_next_ocp_if(&p, &i);
2452 if (os->flags & OCPIF_SWSUP_IDLE) {
2453 /* XXX omap_iclk_deny_idle(c); */
2455 /* XXX omap_iclk_allow_idle(c); */
2456 clk_enable(os->_clk);
2464 * _setup_reset - reset an IP block during the setup process
2465 * @oh: struct omap_hwmod *
2467 * Reset the IP block corresponding to the hwmod @oh during the setup
2468 * process. The IP block is first enabled so it can be successfully
2469 * reset. Returns 0 upon success or a negative error code upon
2472 static int __init _setup_reset(struct omap_hwmod *oh)
2476 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2479 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2482 if (oh->rst_lines_cnt == 0) {
2485 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2486 oh->name, oh->_state);
2491 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2498 * _setup_postsetup - transition to the appropriate state after _setup
2499 * @oh: struct omap_hwmod *
2501 * Place an IP block represented by @oh into a "post-setup" state --
2502 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2503 * this function is called at the end of _setup().) The postsetup
2504 * state for an IP block can be changed by calling
2505 * omap_hwmod_enter_postsetup_state() early in the boot process,
2506 * before one of the omap_hwmod_setup*() functions are called for the
2509 * The IP block stays in this state until a PM runtime-based driver is
2510 * loaded for that IP block. A post-setup state of IDLE is
2511 * appropriate for almost all IP blocks with runtime PM-enabled
2512 * drivers, since those drivers are able to enable the IP block. A
2513 * post-setup state of ENABLED is appropriate for kernels with PM
2514 * runtime disabled. The DISABLED state is appropriate for unusual IP
2515 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2516 * included, since the WDTIMER starts running on reset and will reset
2517 * the MPU if left active.
2519 * This post-setup mechanism is deprecated. Once all of the OMAP
2520 * drivers have been converted to use PM runtime, and all of the IP
2521 * block data and interconnect data is available to the hwmod code, it
2522 * should be possible to replace this mechanism with a "lazy reset"
2523 * arrangement. In a "lazy reset" setup, each IP block is enabled
2524 * when the driver first probes, then all remaining IP blocks without
2525 * drivers are either shut down or enabled after the drivers have
2526 * loaded. However, this cannot take place until the above
2527 * preconditions have been met, since otherwise the late reset code
2528 * has no way of knowing which IP blocks are in use by drivers, and
2529 * which ones are unused.
2533 static void __init _setup_postsetup(struct omap_hwmod *oh)
2537 if (oh->rst_lines_cnt > 0)
2540 postsetup_state = oh->_postsetup_state;
2541 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2542 postsetup_state = _HWMOD_STATE_ENABLED;
2545 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2546 * it should be set by the core code as a runtime flag during startup
2548 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2549 (postsetup_state == _HWMOD_STATE_IDLE)) {
2550 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2551 postsetup_state = _HWMOD_STATE_ENABLED;
2554 if (postsetup_state == _HWMOD_STATE_IDLE)
2556 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2558 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2559 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2560 oh->name, postsetup_state);
2566 * _setup - prepare IP block hardware for use
2567 * @oh: struct omap_hwmod *
2568 * @n: (unused, pass NULL)
2570 * Configure the IP block represented by @oh. This may include
2571 * enabling the IP block, resetting it, and placing it into a
2572 * post-setup state, depending on the type of IP block and applicable
2573 * flags. IP blocks are reset to prevent any previous configuration
2574 * by the bootloader or previous operating system from interfering
2575 * with power management or other parts of the system. The reset can
2576 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2577 * two phases for hwmod initialization. Code called here generally
2578 * affects the IP block hardware, or system integration hardware
2579 * associated with the IP block. Returns 0.
2581 static int __init _setup(struct omap_hwmod *oh, void *data)
2583 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2586 _setup_iclk_autoidle(oh);
2588 if (!_setup_reset(oh))
2589 _setup_postsetup(oh);
2595 * _register - register a struct omap_hwmod
2596 * @oh: struct omap_hwmod *
2598 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2599 * already has been registered by the same name; -EINVAL if the
2600 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2601 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2602 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2605 * XXX The data should be copied into bootmem, so the original data
2606 * should be marked __initdata and freed after init. This would allow
2607 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2608 * that the copy process would be relatively complex due to the large number
2611 static int __init _register(struct omap_hwmod *oh)
2613 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2614 (oh->_state != _HWMOD_STATE_UNKNOWN))
2617 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2619 if (_lookup(oh->name))
2622 list_add_tail(&oh->node, &omap_hwmod_list);
2624 INIT_LIST_HEAD(&oh->master_ports);
2625 INIT_LIST_HEAD(&oh->slave_ports);
2626 spin_lock_init(&oh->_lock);
2628 oh->_state = _HWMOD_STATE_REGISTERED;
2631 * XXX Rather than doing a strcmp(), this should test a flag
2632 * set in the hwmod data, inserted by the autogenerator code.
2634 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2641 * _alloc_links - return allocated memory for hwmod links
2642 * @ml: pointer to a struct omap_hwmod_link * for the master link
2643 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2645 * Return pointers to two struct omap_hwmod_link records, via the
2646 * addresses pointed to by @ml and @sl. Will first attempt to return
2647 * memory allocated as part of a large initial block, but if that has
2648 * been exhausted, will allocate memory itself. Since ideally this
2649 * second allocation path will never occur, the number of these
2650 * 'supplemental' allocations will be logged when debugging is
2651 * enabled. Returns 0.
2653 static int __init _alloc_links(struct omap_hwmod_link **ml,
2654 struct omap_hwmod_link **sl)
2658 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2659 *ml = &linkspace[free_ls++];
2660 *sl = &linkspace[free_ls++];
2664 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2667 *ml = alloc_bootmem(sz);
2671 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2674 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2675 ls_supp * LINKS_PER_OCP_IF);
2681 * _add_link - add an interconnect between two IP blocks
2682 * @oi: pointer to a struct omap_hwmod_ocp_if record
2684 * Add struct omap_hwmod_link records connecting the master IP block
2685 * specified in @oi->master to @oi, and connecting the slave IP block
2686 * specified in @oi->slave to @oi. This code is assumed to run before
2687 * preemption or SMP has been enabled, thus avoiding the need for
2688 * locking in this code. Changes to this assumption will require
2689 * additional locking. Returns 0.
2691 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2693 struct omap_hwmod_link *ml, *sl;
2695 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2698 _alloc_links(&ml, &sl);
2701 INIT_LIST_HEAD(&ml->node);
2702 list_add(&ml->node, &oi->master->master_ports);
2703 oi->master->masters_cnt++;
2706 INIT_LIST_HEAD(&sl->node);
2707 list_add(&sl->node, &oi->slave->slave_ports);
2708 oi->slave->slaves_cnt++;
2714 * _register_link - register a struct omap_hwmod_ocp_if
2715 * @oi: struct omap_hwmod_ocp_if *
2717 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2718 * has already been registered; -EINVAL if @oi is NULL or if the
2719 * record pointed to by @oi is missing required fields; or 0 upon
2722 * XXX The data should be copied into bootmem, so the original data
2723 * should be marked __initdata and freed after init. This would allow
2724 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2726 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2728 if (!oi || !oi->master || !oi->slave || !oi->user)
2731 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2734 pr_debug("omap_hwmod: registering link from %s to %s\n",
2735 oi->master->name, oi->slave->name);
2738 * Register the connected hwmods, if they haven't been
2739 * registered already
2741 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2742 _register(oi->master);
2744 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2745 _register(oi->slave);
2749 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2755 * _alloc_linkspace - allocate large block of hwmod links
2756 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2758 * Allocate a large block of struct omap_hwmod_link records. This
2759 * improves boot time significantly by avoiding the need to allocate
2760 * individual records one by one. If the number of records to
2761 * allocate in the block hasn't been manually specified, this function
2762 * will count the number of struct omap_hwmod_ocp_if records in @ois
2763 * and use that to determine the allocation size. For SoC families
2764 * that require multiple list registrations, such as OMAP3xxx, this
2765 * estimation process isn't optimal, so manual estimation is advised
2766 * in those cases. Returns -EEXIST if the allocation has already occurred
2767 * or 0 upon success.
2769 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2775 WARN(1, "linkspace already allocated\n");
2781 max_ls += LINKS_PER_OCP_IF;
2783 sz = sizeof(struct omap_hwmod_link) * max_ls;
2785 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2786 __func__, sz, max_ls);
2788 linkspace = alloc_bootmem(sz);
2790 memset(linkspace, 0, sz);
2795 /* Static functions intended only for use in soc_ops field function pointers */
2798 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle
2799 * @oh: struct omap_hwmod *
2801 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2802 * does not have an IDLEST bit or if the module successfully leaves
2803 * slave idle; otherwise, pass along the return value of the
2804 * appropriate *_cm*_wait_module_ready() function.
2806 static int _omap2xxx_wait_target_ready(struct omap_hwmod *oh)
2811 if (oh->flags & HWMOD_NO_IDLEST)
2814 if (!_find_mpu_rt_port(oh))
2817 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2819 return omap2xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2820 oh->prcm.omap2.idlest_reg_id,
2821 oh->prcm.omap2.idlest_idle_bit);
2825 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle
2826 * @oh: struct omap_hwmod *
2828 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2829 * does not have an IDLEST bit or if the module successfully leaves
2830 * slave idle; otherwise, pass along the return value of the
2831 * appropriate *_cm*_wait_module_ready() function.
2833 static int _omap3xxx_wait_target_ready(struct omap_hwmod *oh)
2838 if (oh->flags & HWMOD_NO_IDLEST)
2841 if (!_find_mpu_rt_port(oh))
2844 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2846 return omap3xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2847 oh->prcm.omap2.idlest_reg_id,
2848 oh->prcm.omap2.idlest_idle_bit);
2852 * _omap4_wait_target_ready - wait for a module to leave slave idle
2853 * @oh: struct omap_hwmod *
2855 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2856 * does not have an IDLEST bit or if the module successfully leaves
2857 * slave idle; otherwise, pass along the return value of the
2858 * appropriate *_cm*_wait_module_ready() function.
2860 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2865 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2868 if (!_find_mpu_rt_port(oh))
2871 /* XXX check module SIDLEMODE, hardreset status */
2873 return omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
2875 oh->clkdm->clkdm_offs,
2876 oh->prcm.omap4.clkctrl_offs);
2880 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2881 * @oh: struct omap_hwmod *
2883 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2884 * does not have an IDLEST bit or if the module successfully leaves
2885 * slave idle; otherwise, pass along the return value of the
2886 * appropriate *_cm*_wait_module_ready() function.
2888 static int _am33xx_wait_target_ready(struct omap_hwmod *oh)
2890 if (!oh || !oh->clkdm)
2893 if (oh->flags & HWMOD_NO_IDLEST)
2896 if (!_find_mpu_rt_port(oh))
2899 /* XXX check module SIDLEMODE, hardreset status */
2901 return am33xx_cm_wait_module_ready(oh->clkdm->cm_inst,
2902 oh->clkdm->clkdm_offs,
2903 oh->prcm.omap4.clkctrl_offs);
2907 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2908 * @oh: struct omap_hwmod * to assert hardreset
2909 * @ohri: hardreset line data
2911 * Call omap2_prm_assert_hardreset() with parameters extracted from
2912 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2913 * use as an soc_ops function pointer. Passes along the return value
2914 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2915 * for removal when the PRM code is moved into drivers/.
2917 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2918 struct omap_hwmod_rst_info *ohri)
2920 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
2925 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2926 * @oh: struct omap_hwmod * to deassert hardreset
2927 * @ohri: hardreset line data
2929 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2930 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2931 * use as an soc_ops function pointer. Passes along the return value
2932 * from omap2_prm_deassert_hardreset(). XXX This function is
2933 * scheduled for removal when the PRM code is moved into drivers/.
2935 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2936 struct omap_hwmod_rst_info *ohri)
2938 return omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
2944 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2945 * @oh: struct omap_hwmod * to test hardreset
2946 * @ohri: hardreset line data
2948 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2949 * from the hwmod @oh and the hardreset line data @ohri. Only
2950 * intended for use as an soc_ops function pointer. Passes along the
2951 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2952 * function is scheduled for removal when the PRM code is moved into
2955 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2956 struct omap_hwmod_rst_info *ohri)
2958 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
2963 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2964 * @oh: struct omap_hwmod * to assert hardreset
2965 * @ohri: hardreset line data
2967 * Call omap4_prminst_assert_hardreset() with parameters extracted
2968 * from the hwmod @oh and the hardreset line data @ohri. Only
2969 * intended for use as an soc_ops function pointer. Passes along the
2970 * return value from omap4_prminst_assert_hardreset(). XXX This
2971 * function is scheduled for removal when the PRM code is moved into
2974 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2975 struct omap_hwmod_rst_info *ohri)
2980 return omap4_prminst_assert_hardreset(ohri->rst_shift,
2981 oh->clkdm->pwrdm.ptr->prcm_partition,
2982 oh->clkdm->pwrdm.ptr->prcm_offs,
2983 oh->prcm.omap4.rstctrl_offs);
2987 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2988 * @oh: struct omap_hwmod * to deassert hardreset
2989 * @ohri: hardreset line data
2991 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2992 * from the hwmod @oh and the hardreset line data @ohri. Only
2993 * intended for use as an soc_ops function pointer. Passes along the
2994 * return value from omap4_prminst_deassert_hardreset(). XXX This
2995 * function is scheduled for removal when the PRM code is moved into
2998 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2999 struct omap_hwmod_rst_info *ohri)
3005 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3006 oh->name, ohri->name);
3007 return omap4_prminst_deassert_hardreset(ohri->rst_shift,
3008 oh->clkdm->pwrdm.ptr->prcm_partition,
3009 oh->clkdm->pwrdm.ptr->prcm_offs,
3010 oh->prcm.omap4.rstctrl_offs);
3014 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3015 * @oh: struct omap_hwmod * to test hardreset
3016 * @ohri: hardreset line data
3018 * Call omap4_prminst_is_hardreset_asserted() with parameters
3019 * extracted from the hwmod @oh and the hardreset line data @ohri.
3020 * Only intended for use as an soc_ops function pointer. Passes along
3021 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3022 * This function is scheduled for removal when the PRM code is moved
3025 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
3026 struct omap_hwmod_rst_info *ohri)
3031 return omap4_prminst_is_hardreset_asserted(ohri->rst_shift,
3032 oh->clkdm->pwrdm.ptr->prcm_partition,
3033 oh->clkdm->pwrdm.ptr->prcm_offs,
3034 oh->prcm.omap4.rstctrl_offs);
3038 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3039 * @oh: struct omap_hwmod * to assert hardreset
3040 * @ohri: hardreset line data
3042 * Call am33xx_prminst_assert_hardreset() with parameters extracted
3043 * from the hwmod @oh and the hardreset line data @ohri. Only
3044 * intended for use as an soc_ops function pointer. Passes along the
3045 * return value from am33xx_prminst_assert_hardreset(). XXX This
3046 * function is scheduled for removal when the PRM code is moved into
3049 static int _am33xx_assert_hardreset(struct omap_hwmod *oh,
3050 struct omap_hwmod_rst_info *ohri)
3053 return am33xx_prm_assert_hardreset(ohri->rst_shift,
3054 oh->clkdm->pwrdm.ptr->prcm_offs,
3055 oh->prcm.omap4.rstctrl_offs);
3059 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3060 * @oh: struct omap_hwmod * to deassert hardreset
3061 * @ohri: hardreset line data
3063 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3064 * from the hwmod @oh and the hardreset line data @ohri. Only
3065 * intended for use as an soc_ops function pointer. Passes along the
3066 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3067 * function is scheduled for removal when the PRM code is moved into
3070 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
3071 struct omap_hwmod_rst_info *ohri)
3073 return am33xx_prm_deassert_hardreset(ohri->rst_shift,
3075 oh->clkdm->pwrdm.ptr->prcm_offs,
3076 oh->prcm.omap4.rstctrl_offs,
3077 oh->prcm.omap4.rstst_offs);
3081 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
3082 * @oh: struct omap_hwmod * to test hardreset
3083 * @ohri: hardreset line data
3085 * Call am33xx_prminst_is_hardreset_asserted() with parameters
3086 * extracted from the hwmod @oh and the hardreset line data @ohri.
3087 * Only intended for use as an soc_ops function pointer. Passes along
3088 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
3089 * This function is scheduled for removal when the PRM code is moved
3092 static int _am33xx_is_hardreset_asserted(struct omap_hwmod *oh,
3093 struct omap_hwmod_rst_info *ohri)
3095 return am33xx_prm_is_hardreset_asserted(ohri->rst_shift,
3096 oh->clkdm->pwrdm.ptr->prcm_offs,
3097 oh->prcm.omap4.rstctrl_offs);
3100 /* Public functions */
3102 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
3104 if (oh->flags & HWMOD_16BIT_REG)
3105 return __raw_readw(oh->_mpu_rt_va + reg_offs);
3107 return __raw_readl(oh->_mpu_rt_va + reg_offs);
3110 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
3112 if (oh->flags & HWMOD_16BIT_REG)
3113 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
3115 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
3119 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3120 * @oh: struct omap_hwmod *
3122 * This is a public function exposed to drivers. Some drivers may need to do
3123 * some settings before and after resetting the device. Those drivers after
3124 * doing the necessary settings could use this function to start a reset by
3125 * setting the SYSCONFIG.SOFTRESET bit.
3127 int omap_hwmod_softreset(struct omap_hwmod *oh)
3132 if (!oh || !(oh->_sysc_cache))
3135 v = oh->_sysc_cache;
3136 ret = _set_softreset(oh, &v);
3139 _write_sysconfig(v, oh);
3146 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
3147 * @oh: struct omap_hwmod *
3148 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
3150 * Sets the IP block's OCP slave idlemode in hardware, and updates our
3151 * local copy. Intended to be used by drivers that have some erratum
3152 * that requires direct manipulation of the SIDLEMODE bits. Returns
3153 * -EINVAL if @oh is null, or passes along the return value from
3154 * _set_slave_idlemode().
3156 * XXX Does this function have any current users? If not, we should
3157 * remove it; it is better to let the rest of the hwmod code handle this.
3158 * Any users of this function should be scrutinized carefully.
3160 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
3168 v = oh->_sysc_cache;
3170 retval = _set_slave_idlemode(oh, idlemode, &v);
3172 _write_sysconfig(v, oh);
3178 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3179 * @name: name of the omap_hwmod to look up
3181 * Given a @name of an omap_hwmod, return a pointer to the registered
3182 * struct omap_hwmod *, or NULL upon error.
3184 struct omap_hwmod *omap_hwmod_lookup(const char *name)
3186 struct omap_hwmod *oh;
3197 * omap_hwmod_for_each - call function for each registered omap_hwmod
3198 * @fn: pointer to a callback function
3199 * @data: void * data to pass to callback function
3201 * Call @fn for each registered omap_hwmod, passing @data to each
3202 * function. @fn must return 0 for success or any other value for
3203 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3204 * will stop and the non-zero return value will be passed to the
3205 * caller of omap_hwmod_for_each(). @fn is called with
3206 * omap_hwmod_for_each() held.
3208 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3211 struct omap_hwmod *temp_oh;
3217 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3218 ret = (*fn)(temp_oh, data);
3227 * omap_hwmod_register_links - register an array of hwmod links
3228 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3230 * Intended to be called early in boot before the clock framework is
3231 * initialized. If @ois is not null, will register all omap_hwmods
3232 * listed in @ois that are valid for this chip. Returns -EINVAL if
3233 * omap_hwmod_init() hasn't been called before calling this function,
3234 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3237 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3248 if (_alloc_linkspace(ois)) {
3249 pr_err("omap_hwmod: could not allocate link space\n");
3256 r = _register_link(ois[i]);
3257 WARN(r && r != -EEXIST,
3258 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3259 ois[i]->master->name, ois[i]->slave->name, r);
3266 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3267 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3269 * If the hwmod data corresponding to the MPU subsystem IP block
3270 * hasn't been initialized and set up yet, do so now. This must be
3271 * done first since sleep dependencies may be added from other hwmods
3272 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3275 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3277 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3278 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3279 __func__, MPU_INITIATOR_NAME);
3280 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3281 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3285 * omap_hwmod_setup_one - set up a single hwmod
3286 * @oh_name: const char * name of the already-registered hwmod to set up
3288 * Initialize and set up a single hwmod. Intended to be used for a
3289 * small number of early devices, such as the timer IP blocks used for
3290 * the scheduler clock. Must be called after omap2_clk_init().
3291 * Resolves the struct clk names to struct clk pointers for each
3292 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3293 * -EINVAL upon error or 0 upon success.
3295 int __init omap_hwmod_setup_one(const char *oh_name)
3297 struct omap_hwmod *oh;
3299 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3301 oh = _lookup(oh_name);
3303 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3307 _ensure_mpu_hwmod_is_setup(oh);
3316 * omap_hwmod_setup_all - set up all registered IP blocks
3318 * Initialize and set up all IP blocks registered with the hwmod code.
3319 * Must be called after omap2_clk_init(). Resolves the struct clk
3320 * names to struct clk pointers for each registered omap_hwmod. Also
3321 * calls _setup() on each hwmod. Returns 0 upon success.
3323 static int __init omap_hwmod_setup_all(void)
3325 _ensure_mpu_hwmod_is_setup(NULL);
3327 omap_hwmod_for_each(_init, NULL);
3328 omap_hwmod_for_each(_setup, NULL);
3332 omap_core_initcall(omap_hwmod_setup_all);
3335 * omap_hwmod_enable - enable an omap_hwmod
3336 * @oh: struct omap_hwmod *
3338 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3339 * Returns -EINVAL on error or passes along the return value from _enable().
3341 int omap_hwmod_enable(struct omap_hwmod *oh)
3344 unsigned long flags;
3349 spin_lock_irqsave(&oh->_lock, flags);
3351 spin_unlock_irqrestore(&oh->_lock, flags);
3357 * omap_hwmod_idle - idle an omap_hwmod
3358 * @oh: struct omap_hwmod *
3360 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3361 * Returns -EINVAL on error or passes along the return value from _idle().
3363 int omap_hwmod_idle(struct omap_hwmod *oh)
3365 unsigned long flags;
3370 spin_lock_irqsave(&oh->_lock, flags);
3372 spin_unlock_irqrestore(&oh->_lock, flags);
3378 * omap_hwmod_shutdown - shutdown an omap_hwmod
3379 * @oh: struct omap_hwmod *
3381 * Shutdown an omap_hwmod @oh. Intended to be called by
3382 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3383 * the return value from _shutdown().
3385 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3387 unsigned long flags;
3392 spin_lock_irqsave(&oh->_lock, flags);
3394 spin_unlock_irqrestore(&oh->_lock, flags);
3400 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3401 * @oh: struct omap_hwmod *oh
3403 * Intended to be called by the omap_device code.
3405 int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
3407 unsigned long flags;
3409 spin_lock_irqsave(&oh->_lock, flags);
3411 spin_unlock_irqrestore(&oh->_lock, flags);
3417 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3418 * @oh: struct omap_hwmod *oh
3420 * Intended to be called by the omap_device code.
3422 int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
3424 unsigned long flags;
3426 spin_lock_irqsave(&oh->_lock, flags);
3427 _disable_clocks(oh);
3428 spin_unlock_irqrestore(&oh->_lock, flags);
3434 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3435 * @oh: struct omap_hwmod *oh
3437 * Intended to be called by drivers and core code when all posted
3438 * writes to a device must complete before continuing further
3439 * execution (for example, after clearing some device IRQSTATUS
3442 * XXX what about targets with multiple OCP threads?
3444 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
3448 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
3449 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3455 * Forces posted writes to complete on the OCP thread handling
3458 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
3462 * omap_hwmod_reset - reset the hwmod
3463 * @oh: struct omap_hwmod *
3465 * Under some conditions, a driver may wish to reset the entire device.
3466 * Called from omap_device code. Returns -EINVAL on error or passes along
3467 * the return value from _reset().
3469 int omap_hwmod_reset(struct omap_hwmod *oh)
3472 unsigned long flags;
3477 spin_lock_irqsave(&oh->_lock, flags);
3479 spin_unlock_irqrestore(&oh->_lock, flags);
3485 * IP block data retrieval functions
3489 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3490 * @oh: struct omap_hwmod *
3491 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3493 * Count the number of struct resource array elements necessary to
3494 * contain omap_hwmod @oh resources. Intended to be called by code
3495 * that registers omap_devices. Intended to be used to determine the
3496 * size of a dynamically-allocated struct resource array, before
3497 * calling omap_hwmod_fill_resources(). Returns the number of struct
3498 * resource array elements needed.
3500 * XXX This code is not optimized. It could attempt to merge adjacent
3504 int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags)
3508 if (flags & IORESOURCE_IRQ)
3509 ret += _count_mpu_irqs(oh);
3511 if (flags & IORESOURCE_DMA)
3512 ret += _count_sdma_reqs(oh);
3514 if (flags & IORESOURCE_MEM) {
3516 struct omap_hwmod_ocp_if *os;
3517 struct list_head *p = oh->slave_ports.next;
3519 while (i < oh->slaves_cnt) {
3520 os = _fetch_next_ocp_if(&p, &i);
3521 ret += _count_ocp_if_addr_spaces(os);
3529 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3530 * @oh: struct omap_hwmod *
3531 * @res: pointer to the first element of an array of struct resource to fill
3533 * Fill the struct resource array @res with resource data from the
3534 * omap_hwmod @oh. Intended to be called by code that registers
3535 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3536 * number of array elements filled.
3538 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3540 struct omap_hwmod_ocp_if *os;
3541 struct list_head *p;
3542 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3545 /* For each IRQ, DMA, memory area, fill in array.*/
3547 mpu_irqs_cnt = _count_mpu_irqs(oh);
3548 for (i = 0; i < mpu_irqs_cnt; i++) {
3549 (res + r)->name = (oh->mpu_irqs + i)->name;
3550 (res + r)->start = (oh->mpu_irqs + i)->irq;
3551 (res + r)->end = (oh->mpu_irqs + i)->irq;
3552 (res + r)->flags = IORESOURCE_IRQ;
3556 sdma_reqs_cnt = _count_sdma_reqs(oh);
3557 for (i = 0; i < sdma_reqs_cnt; i++) {
3558 (res + r)->name = (oh->sdma_reqs + i)->name;
3559 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3560 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3561 (res + r)->flags = IORESOURCE_DMA;
3565 p = oh->slave_ports.next;
3568 while (i < oh->slaves_cnt) {
3569 os = _fetch_next_ocp_if(&p, &i);
3570 addr_cnt = _count_ocp_if_addr_spaces(os);
3572 for (j = 0; j < addr_cnt; j++) {
3573 (res + r)->name = (os->addr + j)->name;
3574 (res + r)->start = (os->addr + j)->pa_start;
3575 (res + r)->end = (os->addr + j)->pa_end;
3576 (res + r)->flags = IORESOURCE_MEM;
3585 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3586 * @oh: struct omap_hwmod *
3587 * @res: pointer to the array of struct resource to fill
3589 * Fill the struct resource array @res with dma resource data from the
3590 * omap_hwmod @oh. Intended to be called by code that registers
3591 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3592 * number of array elements filled.
3594 int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
3596 int i, sdma_reqs_cnt;
3599 sdma_reqs_cnt = _count_sdma_reqs(oh);
3600 for (i = 0; i < sdma_reqs_cnt; i++) {
3601 (res + r)->name = (oh->sdma_reqs + i)->name;
3602 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3603 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3604 (res + r)->flags = IORESOURCE_DMA;
3612 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3613 * @oh: struct omap_hwmod * to operate on
3614 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3615 * @name: pointer to the name of the data to fetch (optional)
3616 * @rsrc: pointer to a struct resource, allocated by the caller
3618 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3619 * data for the IP block pointed to by @oh. The data will be filled
3620 * into a struct resource record pointed to by @rsrc. The struct
3621 * resource must be allocated by the caller. When @name is non-null,
3622 * the data associated with the matching entry in the IRQ/SDMA/address
3623 * space hwmod data arrays will be returned. If @name is null, the
3624 * first array entry will be returned. Data order is not meaningful
3625 * in hwmod data, so callers are strongly encouraged to use a non-null
3626 * @name whenever possible to avoid unpredictable effects if hwmod
3627 * data is later added that causes data ordering to change. This
3628 * function is only intended for use by OMAP core code. Device
3629 * drivers should not call this function - the appropriate bus-related
3630 * data accessor functions should be used instead. Returns 0 upon
3631 * success or a negative error code upon error.
3633 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3634 const char *name, struct resource *rsrc)
3637 unsigned int irq, dma;
3638 u32 pa_start, pa_end;
3643 if (type == IORESOURCE_IRQ) {
3644 r = _get_mpu_irq_by_name(oh, name, &irq);
3650 } else if (type == IORESOURCE_DMA) {
3651 r = _get_sdma_req_by_name(oh, name, &dma);
3657 } else if (type == IORESOURCE_MEM) {
3658 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3662 rsrc->start = pa_start;
3675 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3676 * @oh: struct omap_hwmod *
3678 * Return the powerdomain pointer associated with the OMAP module
3679 * @oh's main clock. If @oh does not have a main clk, return the
3680 * powerdomain associated with the interface clock associated with the
3681 * module's MPU port. (XXX Perhaps this should use the SDMA port
3682 * instead?) Returns NULL on error, or a struct powerdomain * on
3685 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3688 struct omap_hwmod_ocp_if *oi;
3689 struct clockdomain *clkdm;
3690 struct clk_hw_omap *clk;
3696 return oh->clkdm->pwrdm.ptr;
3701 oi = _find_mpu_rt_port(oh);
3707 clk = to_clk_hw_omap(__clk_get_hw(c));
3712 return clkdm->pwrdm.ptr;
3716 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3717 * @oh: struct omap_hwmod *
3719 * Returns the virtual address corresponding to the beginning of the
3720 * module's register target, in the address range that is intended to
3721 * be used by the MPU. Returns the virtual address upon success or NULL
3724 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3729 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3732 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3735 return oh->_mpu_rt_va;
3739 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3740 * @oh: struct omap_hwmod *
3741 * @init_oh: struct omap_hwmod * (initiator)
3743 * Add a sleep dependency between the initiator @init_oh and @oh.
3744 * Intended to be called by DSP/Bridge code via platform_data for the
3745 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3746 * code needs to add/del initiator dependencies dynamically
3747 * before/after accessing a device. Returns the return value from
3748 * _add_initiator_dep().
3750 * XXX Keep a usecount in the clockdomain code
3752 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
3753 struct omap_hwmod *init_oh)
3755 return _add_initiator_dep(oh, init_oh);
3759 * XXX what about functions for drivers to save/restore ocp_sysconfig
3760 * for context save/restore operations?
3764 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3765 * @oh: struct omap_hwmod *
3766 * @init_oh: struct omap_hwmod * (initiator)
3768 * Remove a sleep dependency between the initiator @init_oh and @oh.
3769 * Intended to be called by DSP/Bridge code via platform_data for the
3770 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3771 * code needs to add/del initiator dependencies dynamically
3772 * before/after accessing a device. Returns the return value from
3773 * _del_initiator_dep().
3775 * XXX Keep a usecount in the clockdomain code
3777 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
3778 struct omap_hwmod *init_oh)
3780 return _del_initiator_dep(oh, init_oh);
3784 * omap_hwmod_enable_wakeup - allow device to wake up the system
3785 * @oh: struct omap_hwmod *
3787 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3788 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3789 * this IP block if it has dynamic mux entries. Eventually this
3790 * should set PRCM wakeup registers to cause the PRCM to receive
3791 * wakeup events from the module. Does not set any wakeup routing
3792 * registers beyond this point - if the module is to wake up any other
3793 * module or subsystem, that must be set separately. Called by
3794 * omap_device code. Returns -EINVAL on error or 0 upon success.
3796 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3798 unsigned long flags;
3801 spin_lock_irqsave(&oh->_lock, flags);
3803 if (oh->class->sysc &&
3804 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3805 v = oh->_sysc_cache;
3806 _enable_wakeup(oh, &v);
3807 _write_sysconfig(v, oh);
3810 _set_idle_ioring_wakeup(oh, true);
3811 spin_unlock_irqrestore(&oh->_lock, flags);
3817 * omap_hwmod_disable_wakeup - prevent device from waking the system
3818 * @oh: struct omap_hwmod *
3820 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3821 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3822 * events for this IP block if it has dynamic mux entries. Eventually
3823 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3824 * wakeup events from the module. Does not set any wakeup routing
3825 * registers beyond this point - if the module is to wake up any other
3826 * module or subsystem, that must be set separately. Called by
3827 * omap_device code. Returns -EINVAL on error or 0 upon success.
3829 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3831 unsigned long flags;
3834 spin_lock_irqsave(&oh->_lock, flags);
3836 if (oh->class->sysc &&
3837 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3838 v = oh->_sysc_cache;
3839 _disable_wakeup(oh, &v);
3840 _write_sysconfig(v, oh);
3843 _set_idle_ioring_wakeup(oh, false);
3844 spin_unlock_irqrestore(&oh->_lock, flags);
3850 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3851 * contained in the hwmod module.
3852 * @oh: struct omap_hwmod *
3853 * @name: name of the reset line to lookup and assert
3855 * Some IP like dsp, ipu or iva contain processor that require
3856 * an HW reset line to be assert / deassert in order to enable fully
3857 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3858 * yet supported on this OMAP; otherwise, passes along the return value
3859 * from _assert_hardreset().
3861 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3864 unsigned long flags;
3869 spin_lock_irqsave(&oh->_lock, flags);
3870 ret = _assert_hardreset(oh, name);
3871 spin_unlock_irqrestore(&oh->_lock, flags);
3877 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3878 * contained in the hwmod module.
3879 * @oh: struct omap_hwmod *
3880 * @name: name of the reset line to look up and deassert
3882 * Some IP like dsp, ipu or iva contain processor that require
3883 * an HW reset line to be assert / deassert in order to enable fully
3884 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3885 * yet supported on this OMAP; otherwise, passes along the return value
3886 * from _deassert_hardreset().
3888 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3891 unsigned long flags;
3896 spin_lock_irqsave(&oh->_lock, flags);
3897 ret = _deassert_hardreset(oh, name);
3898 spin_unlock_irqrestore(&oh->_lock, flags);
3904 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3905 * contained in the hwmod module
3906 * @oh: struct omap_hwmod *
3907 * @name: name of the reset line to look up and read
3909 * Return the current state of the hwmod @oh's reset line named @name:
3910 * returns -EINVAL upon parameter error or if this operation
3911 * is unsupported on the current OMAP; otherwise, passes along the return
3912 * value from _read_hardreset().
3914 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
3917 unsigned long flags;
3922 spin_lock_irqsave(&oh->_lock, flags);
3923 ret = _read_hardreset(oh, name);
3924 spin_unlock_irqrestore(&oh->_lock, flags);
3931 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3932 * @classname: struct omap_hwmod_class name to search for
3933 * @fn: callback function pointer to call for each hwmod in class @classname
3934 * @user: arbitrary context data to pass to the callback function
3936 * For each omap_hwmod of class @classname, call @fn.
3937 * If the callback function returns something other than
3938 * zero, the iterator is terminated, and the callback function's return
3939 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3940 * if @classname or @fn are NULL, or passes back the error code from @fn.
3942 int omap_hwmod_for_each_by_class(const char *classname,
3943 int (*fn)(struct omap_hwmod *oh,
3947 struct omap_hwmod *temp_oh;
3950 if (!classname || !fn)
3953 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3954 __func__, classname);
3956 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3957 if (!strcmp(temp_oh->class->name, classname)) {
3958 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3959 __func__, temp_oh->name);
3960 ret = (*fn)(temp_oh, user);
3967 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3974 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3975 * @oh: struct omap_hwmod *
3976 * @state: state that _setup() should leave the hwmod in
3978 * Sets the hwmod state that @oh will enter at the end of _setup()
3979 * (called by omap_hwmod_setup_*()). See also the documentation
3980 * for _setup_postsetup(), above. Returns 0 upon success or
3981 * -EINVAL if there is a problem with the arguments or if the hwmod is
3982 * in the wrong state.
3984 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3987 unsigned long flags;
3992 if (state != _HWMOD_STATE_DISABLED &&
3993 state != _HWMOD_STATE_ENABLED &&
3994 state != _HWMOD_STATE_IDLE)
3997 spin_lock_irqsave(&oh->_lock, flags);
3999 if (oh->_state != _HWMOD_STATE_REGISTERED) {
4004 oh->_postsetup_state = state;
4008 spin_unlock_irqrestore(&oh->_lock, flags);
4014 * omap_hwmod_get_context_loss_count - get lost context count
4015 * @oh: struct omap_hwmod *
4017 * Returns the context loss count of associated @oh
4018 * upon success, or zero if no context loss data is available.
4020 * On OMAP4, this queries the per-hwmod context loss register,
4021 * assuming one exists. If not, or on OMAP2/3, this queries the
4022 * enclosing powerdomain context loss count.
4024 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
4026 struct powerdomain *pwrdm;
4029 if (soc_ops.get_context_lost)
4030 return soc_ops.get_context_lost(oh);
4032 pwrdm = omap_hwmod_get_pwrdm(oh);
4034 ret = pwrdm_get_context_loss_count(pwrdm);
4040 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
4041 * @oh: struct omap_hwmod *
4043 * Prevent the hwmod @oh from being reset during the setup process.
4044 * Intended for use by board-*.c files on boards with devices that
4045 * cannot tolerate being reset. Must be called before the hwmod has
4046 * been set up. Returns 0 upon success or negative error code upon
4049 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
4054 if (oh->_state != _HWMOD_STATE_REGISTERED) {
4055 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
4060 oh->flags |= HWMOD_INIT_NO_RESET;
4066 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
4067 * @oh: struct omap_hwmod * containing hwmod mux entries
4068 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
4069 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
4071 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
4072 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
4073 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
4074 * this function is not called for a given pad_idx, then the ISR
4075 * associated with @oh's first MPU IRQ will be triggered when an I/O
4076 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
4077 * the _dynamic or wakeup_ entry: if there are other entries not
4078 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
4079 * entries are NOT COUNTED in the dynamic pad index. This function
4080 * must be called separately for each pad that requires its interrupt
4081 * to be re-routed this way. Returns -EINVAL if there is an argument
4082 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
4083 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
4085 * XXX This function interface is fragile. Rather than using array
4086 * indexes, which are subject to unpredictable change, it should be
4087 * using hwmod IRQ names, and some other stable key for the hwmod mux
4090 int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
4096 if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
4097 pad_idx >= oh->mux->nr_pads_dynamic)
4100 /* Check the number of available mpu_irqs */
4101 for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
4104 if (irq_idx >= nr_irqs)
4107 if (!oh->mux->irqs) {
4108 /* XXX What frees this? */
4109 oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
4114 oh->mux->irqs[pad_idx] = irq_idx;
4120 * omap_hwmod_init - initialize the hwmod code
4122 * Sets up some function pointers needed by the hwmod code to operate on the
4123 * currently-booted SoC. Intended to be called once during kernel init
4124 * before any hwmods are registered. No return value.
4126 void __init omap_hwmod_init(void)
4128 if (cpu_is_omap24xx()) {
4129 soc_ops.wait_target_ready = _omap2xxx_wait_target_ready;
4130 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4131 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4132 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4133 } else if (cpu_is_omap34xx()) {
4134 soc_ops.wait_target_ready = _omap3xxx_wait_target_ready;
4135 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4136 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4137 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4138 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
4139 soc_ops.enable_module = _omap4_enable_module;
4140 soc_ops.disable_module = _omap4_disable_module;
4141 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4142 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4143 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
4144 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4145 soc_ops.init_clkdm = _init_clkdm;
4146 soc_ops.update_context_lost = _omap4_update_context_lost;
4147 soc_ops.get_context_lost = _omap4_get_context_lost;
4148 } else if (soc_is_am33xx()) {
4149 soc_ops.enable_module = _am33xx_enable_module;
4150 soc_ops.disable_module = _am33xx_disable_module;
4151 soc_ops.wait_target_ready = _am33xx_wait_target_ready;
4152 soc_ops.assert_hardreset = _am33xx_assert_hardreset;
4153 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
4154 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted;
4155 soc_ops.init_clkdm = _init_clkdm;
4157 WARN(1, "omap_hwmod: unknown SoC type\n");
4164 * omap_hwmod_get_main_clk - get pointer to main clock name
4165 * @oh: struct omap_hwmod *
4167 * Returns the main clock name assocated with @oh upon success,
4168 * or NULL if @oh is NULL.
4170 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
4175 return oh->main_clk;